Circuit used for streetlamp

Abstract

A circuit used for a streetlamp. The circuit used for a streetlamp comprises: a power factor correction module, a first direct current-direct current conversion module, and a second direct current-direct current conversion module, wherein the power factor correction module outputs a bus voltage; an input end of the first direct current-direct current conversion module is connected in parallel to the bus voltage, and an output end thereof is connected in parallel to a battery; and an input end of the second direct current-direct current conversion module is connected in parallel to the bus voltage, and an output end thereof is connected in parallel to a streetlamp. During an off-peak period, the bus voltage is generated by means of the power factor correction module, and the bus voltage charges the battery via the first direct current-direct current conversion module; and during a peak period, the battery is discharged via the first direct current-direct current conversion module to maintain the bus voltage, and the bus voltage supplies power to the streetlamp via the second direct current-direct current conversion module.

Description

Circuits used in street lights

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent applications filed with the Patent Office of China on January 16, 2024, with application number 2024201064071 and invention name “A circuit applied to street lamps”, and Chinese patent application number 2024203261479 filed with the Patent Office of China on February 22, 2024, with invention name “A relay control module and a circuit applied to street lamps”. The entire contents of the patent applications are incorporated into this disclosure by reference. Technical Field

[0003] The present disclosure relates to the technical field of lighting equipment, and in particular to a circuit applied to a street lamp. Background Art

[0004] Typically, urban roads are equipped with streetlights to ensure safe passage at night. Currently, conventional solar streetlights primarily use solar panels to charge batteries during the day, and then discharge the batteries to illuminate the streetlights at night. However, these single-function solar streetlights are often affected by weather, resulting in low light-up rates. Furthermore, the multi-cell batteries used in series typically come with a battery protection board, and a failure of the protection board can easily cause the battery to catch fire.

[0005] Therefore, there is an urgent need for a new circuit structure suitable for street lamps with batteries. The battery can be charged by the mains and solar energy to ensure the lighting rate and power supply stability when switching between different power sources. At the same time, the protection board is removed to avoid damage to the battery due to protection board failure, fully ensuring battery safety. In addition, the battery energy storage principle is used. During off-peak hours, the battery is charged by the mains and discharged during peak hours without the mains participating in the power supply, thereby balancing the grid load. Summary of the Invention

[0006] The present disclosure provides a circuit for a street lamp, comprising a power factor correction module, a first DC-DC conversion module, and a second DC-DC conversion module. The power factor correction module outputs a bus voltage; the input of the first DC-DC conversion module is connected in parallel with the output of the power factor correction module, and the output of the first DC-DC conversion module is connected in parallel with a battery; the input of the second DC-DC conversion module is connected in parallel with the output of the power factor correction module, and the output of the second DC-DC conversion module is connected in parallel with the street lamp.

[0007] In some embodiments, the circuit applied to street lamps generates a bus voltage through a power factor correction module during off-peak hours, and the bus voltage charges the battery through a first DC-DC conversion module, or the bus voltage charges the battery through the first DC-DC conversion module and supplies power to the street lamp through a second DC-DC conversion module, or the bus voltage supplies power to the street lamp through a second DC-DC conversion module; during peak hours, the battery discharges through the first DC-DC conversion module to maintain the bus voltage, and the bus voltage supplies power to the street lamp through the second DC-DC conversion module.

[0008] In some embodiments, the circuit applied to the street lamp further includes: a rectifier module, the input end of the rectifier module is connected to the alternating current, and the input end of the power factor correction module is connected in parallel with the output end of the rectifier module.

[0009] In some embodiments, the rectifier module includes: a first diode, a second diode, a third diode, and a fourth diode. The cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to the anode of the third diode, the cathode of the third diode is connected to the anode of the first diode, the first end of the alternating current is connected to the anode of the first diode, the second end of the alternating current is connected to the anode of the second diode, and the input end of the power factor correction module is connected in parallel with the cathode of the second diode and the anode of the third diode.

[0010] In some embodiments, the power factor correction module includes: a first capacitor, a first transformer, a first switching tube, a first resistor, a second switching tube, and a second resistor. Among them, one end of the first capacitor is connected to the cathode of the second diode, and the other end is connected to the anode of the third diode, the first end of the primary winding of the first transformer is connected to the cathode of the second diode, the second end of the secondary winding of the first transformer is connected to the secondary ground, the first end of the first switching tube is connected to the second end of the primary winding of the first transformer, one end of the first resistor is connected to the second end of the first switching tube, and the other end is connected to the primary ground, and the second end of the second switching tube is connected to the first end of the secondary winding of the first transformer; the first end of the second capacitor is connected to the first end of the second switching tube, and the second end is connected to the second end of the secondary winding of the first transformer, and both ends of the second capacitor are connected to the input end of the first DC-DC conversion module.

[0011] In some embodiments, the first DC-DC conversion module includes: a third capacitor, a third switching transistor, a fourth switching transistor, a first inductor, and a fourth capacitor. The third capacitor is connected in parallel with the second capacitor, the first end of the third switching transistor is connected to the first end of the third capacitor, the first end of the fourth switching transistor is connected to the second end of the third switching transistor, and the second end is connected to the second end of the third capacitor and the negative electrode of the battery. The first end of the first inductor is connected to the first end of the fourth switching transistor, and the second end is connected to the positive electrode of the battery. The first end of the fourth capacitor is connected to the second end of the first inductor, and the second end is connected to the second end of the fourth switching transistor.

[0012] In some embodiments, the second DC-DC conversion module includes: a fifth capacitor, a second inductor, a fifth switching tube, a fifth diode, a sixth capacitor, and a second resistor. The first end of the fifth capacitor is connected to the first end of the second switching tube, and the second end is connected to the secondary ground terminal. The first end of the second inductor is connected to the first end of the fifth capacitor. The first end of the fifth switching tube is connected to the second end of the second inductor, and the second end is connected to the second end of the fifth capacitor. The anode of the fifth diode is connected to the first end of the fifth switching tube, and the cathode is connected to the first end of the street lamp. The first end of the sixth capacitor is connected to the cathode of the fifth diode, and the second end is connected to the second end of the fifth switching tube. One end of the second resistor is connected to the second end of the sixth capacitor, and the other end is connected to the second end of the street lamp.

[0013] In some embodiments, the circuit applied to the street lamp further includes: a digital controller, which outputs a control signal for controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube.

[0014] In some embodiments, the digital controller monitors the voltage across the streetlight.

[0015] In some embodiments, the circuit applied to the street lamp further includes: a solar panel connected to the input end of the first DC-DC conversion module to charge the battery or power the street lamp.

[0016] In some embodiments, the circuit applied to the street lamp further includes: a control switch, which controls the input end of the first DC-DC conversion module to connect to the output end of the solar cell panel or the power factor correction module.

[0017] In some embodiments, when the input end of the first DC-DC conversion module is connected to the solar panel, the solar panel charges the battery through the first DC-DC conversion module.

[0018] In some embodiments, the circuit applied to the street lamp further includes: a digital controller, which outputs a control signal for controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the control switch.

[0019] In some embodiments, the digital controller monitors the voltage across the streetlight.

[0020] In some embodiments, the circuit for the street lamp further includes a relay control module and a relay module. The relay module is connected to the relay control module, the power factor correction module, the solar panel, and the first DC-DC converter module. Under the control of the relay control module, the relay module connects the input of the first DC-DC converter module to the output of the solar panel or the power factor correction module.

[0021] In some embodiments, the relay control module includes: a sixth switch tube, a seventh switch tube, a third resistor, a first voltage-stabilizing diode, a seventh capacitor, a sixth diode, a fourth resistor, an eighth capacitor, and a fifth resistor. The sixth switch tube has a source connected to ground, a gate connected to a control signal, and a drain connected to the first end of the coil of the relay module; a collector connected to the first end of the switch of the relay module, and an emitter connected to the second end of the coil of the relay module; a first end of the third resistor is connected to the collector of the seventh switch tube, and a second end is connected to the base of the seventh switch tube; an anode of the first voltage-stabilizing diode is grounded, and the base of the seventh switch tube is connected to the cathode of the first voltage-stabilizing diode; a first end of the seventh capacitor is connected to the emitter of the seventh switch tube, and a second end is connected to the anode of the first voltage-stabilizing diode; an anode of the sixth diode is connected to the first end of the switch of the relay module, and a cathode is connected to the second end of the coil of the relay module; a gate of the sixth switch tube is connected to the first end of the fourth resistor, a second end of the fourth resistor is connected to the control signal, and the gate of the sixth switch tube is grounded via the eighth capacitor; and the gate of the sixth switch tube is grounded via the fifth resistor.

[0022] In some embodiments, the circuit applied to the street lamp further includes: a seventh diode, wherein the anode of the seventh diode is connected to the solar cell panel, and the cathode of the seventh diode is connected to the first end of the switch of the relay module.

[0023] In some embodiments, the control signal is generated by a single chip microcomputer.

[0024] In some embodiments, the first DC-DC conversion module is a bidirectional BUCK-BOOST topology.

[0025] In some embodiments, the second DC-DC conversion module is a BOOST topology.

[0026] The details of one or more embodiments of the present disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present disclosure will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the traditional technology, the following briefly introduces the drawings required for use in the embodiments or the description of the traditional technology. Obviously, the drawings described below are only embodiments of the embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without paying any creative work.

[0028] FIG1 is a schematic structural diagram of a circuit applied to a street lamp provided in some embodiments.

[0029] FIG2 is a schematic structural diagram of another circuit applied to a street lamp provided in some embodiments.

[0030] FIG3 is a schematic structural diagram of another circuit applied to a street lamp provided in some embodiments.

[0031] FIG4 is a schematic structural diagram of another circuit applied to a street lamp provided in some embodiments.

[0032] FIG5 is a schematic structural diagram of another circuit applied to a street lamp provided in some embodiments.

[0033] FIG6 is a schematic structural diagram of another circuit applied to a street lamp provided in some embodiments.

[0034] FIG7 is a schematic structural diagram of another circuit applied to a street lamp provided in some embodiments. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions of the embodiments of the present disclosure in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the embodiments of the present disclosure.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0037] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0038] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0039] Please refer to Figure 1 to understand that in some embodiments, a circuit for street lighting is provided. The circuit for street lighting includes: a rectifier module 11, a power factor correction module 12, a first DC-DC conversion module 13, and a second DC-DC conversion module 14. The alternating current (AC) is rectified by the rectifier module 11 to obtain direct current (DC). The input end of the power factor correction module 12 is connected in parallel with the output end of the rectifier module 11, and the output end of the power factor correction module 12 outputs a bus voltage V bus The input end of the first DC-DC conversion module 13 is connected in parallel to the output end of the power factor correction module 12, the output end of the first DC-DC conversion module 13 is connected in parallel to the battery BT, the input end of the second DC-DC conversion module 14 is connected in parallel to the output end of the power factor correction module 12, and the output end of the second DC-DC conversion module 14 is connected in parallel to the street lamp LED.

[0040] For example, the first DC-DC conversion module 13 is a bidirectional DC-DC converter.

[0041] For example, during off-peak hours, the alternating current (AC) is converted into a direct current (DC) by the rectifier module 11 and then passes through the power factor correction module 12 to generate a bus voltage V bus , bus voltage V bus The battery BT is only charged via the first DC-DC conversion module 13, or the bus voltage V bus The battery BT is charged via the first DC-DC conversion module 13, and the street light LED is powered via the second DC-DC conversion module 14, or the bus voltage V bus Only the second DC-DC conversion module 14 is used to power the streetlight LED; during peak power, the battery BT is discharged through the first DC-DC conversion module 13 to maintain the bus voltage V bus , bus voltage V bus The street light LED is powered via the second DC-DC conversion module 14, thereby achieving the function of saving electric energy.

[0042] For example, the second DC-DC conversion module 14 can be used to select whether to turn on the street light LED according to demand. For example, during off-peak hours, the AC is converted into a DC voltage by the rectifier module 11, and then passes through the power factor correction module 12 to generate a bus voltage V bus , the second DC-DC conversion module 14 supplies power to the street lamp.

[0043] Continuing to refer to FIG2 , in some embodiments, the circuit used in the street lamp includes: a rectifier module 21, a power factor correction module 22, a first DC-DC conversion module 23, and a second DC-DC conversion module 24. The alternating current (AC) is rectified by the rectifier module 21 to obtain direct current (DC). The input end of the power factor correction module 22 is connected in parallel with the output end of the rectifier module 21, and the output end of the power factor correction module 22 outputs a bus voltage V bus The input end of the first DC-DC conversion module 23 is connected in parallel to the output end of the power factor correction module 22, the output end of the first DC-DC conversion module 23 is connected in parallel to the battery BT, the input end of the second DC-DC conversion module 24 is connected in parallel to the output end of the power factor correction module 22, and the output end of the second DC-DC conversion module 24 is connected in parallel to the street lamp LED.

[0044] For example, the rectifier module 21 is a rectifier bridge including a diode D1, a diode D2, a diode D3, and a diode D4. The cathode of diode D1 is connected to the cathode of diode D2, the anode of diode D2 is connected to the cathode of diode D4, the anode of diode D4 is connected to the anode of diode D3, the cathode of diode D3 is connected to the anode of diode D1, a first end of the alternating current AC is connected to the anode of diode D1, and a second end of the alternating current AC is connected to the anode of diode D2. The input end of the power factor correction module 22 is connected in parallel with the cathode of diode D2 and the anode of diode D3.

[0045] For example, the power factor correction module 22 can be a flyback conversion topology, but the present disclosure is not limited to this, and other topologies with DC-DC conversion functions can be used. The power factor correction module 22 includes: a capacitor C1, a capacitor C2, a switch tube Q1, a switch tube Q2, a resistor R1 and a transformer T1. Among them, one end of the capacitor C1 is connected to the cathode of the diode D2, and the other end of the capacitor C1 is connected to the anode of the diode D3; the first end of the primary winding of the transformer T1 is connected to the cathode of the diode D2, and the second end of the primary winding of the transformer T1 is connected to the drain of the switch tube Q1; one end of the resistor R1 is connected to the source of the switch tube Q1, and the other end of the resistor R1 is connected to the ground terminal PGND; the first end of the secondary winding of the transformer T1 is connected to the source of the switch tube Q2, the first end of the capacitor C2 is connected to the drain of the switch tube Q2, the second end of the capacitor C2 is connected to the second end of the secondary winding of the transformer T1, and the second end of the secondary winding of the transformer T1 is connected to the ground terminal SGND; the two ends of the capacitor C2 are connected to the input end of the first DC-DC conversion module 23.

[0046] For example, the switch Q1 adopts constant on-time (COT) control.

[0047] For example, the capacitor C2 may include one or more capacitors connected in parallel.

[0048] For example, the switch tube Q1 and the switch tube Q2 may be N-channel MOSFETs.

[0049] For example, the first DC-DC conversion module 23 can be a bidirectional BUCK-BOOST topology, but the present disclosure is not limited to this, and other topologies with bidirectional DC-DC conversion functions can be used. The first DC-DC conversion module 23 includes: a capacitor C3, a capacitor C4, a switch tube Q3, a switch tube Q4 and an inductor L1. Among them, the capacitor C3 is connected in parallel with the capacitor C2, the drain of the switch tube Q3 is connected to the first end of the capacitor C3, the source of the switch tube Q3 is connected to the drain of the switch tube Q4, the source of the switch tube Q4 is connected to the second end of the capacitor C3, the first end of the inductor L1 is connected to the drain of the switch tube Q4, the first end of the capacitor C4 is connected to the second end of the inductor L1, the second end of the capacitor C4 is connected to the source of the switch tube Q4, the positive electrode of the battery BT is connected to the second end of the inductor L1, and the negative electrode of the battery BT is connected to the source of the switch tube Q4.

[0050] For example, the switch tube Q3 and the switch tube Q4 may be N-channel MOSFETs.

[0051] For example, the second DC-DC conversion module 24 can be a BOOST topology, but the present disclosure is not limited to this, and other topologies with DC-DC conversion functions can be used. The second DC-DC conversion module 24 includes: a capacitor C5, a capacitor C6, an inductor L2, a switch tube Q5, a diode D5 and a resistor R2. Among them, the first end of the capacitor C5 is connected to the drain of the switch tube Q2, and the second end of the capacitor C5 is connected to the secondary ground terminal SGND; the first end of the inductor L2 is connected to the first end of the capacitor C5, and the second end of the inductor L2 is connected to the drain of the switch tube Q5; the source of the switch tube Q5 is connected to the second end of the capacitor C5, and the anode of the diode D5 is connected to the drain of the switch tube Q5; the first end of the capacitor C6 is connected to the cathode of the diode D5, and the second end of the capacitor C6 is connected to the source of the switch tube Q5; one end of the resistor R2 is connected to the second end of the capacitor C6, and the other end of the resistor R2 is connected to the cathode of the street lamp LED, and the anode of the street lamp LED is connected to the cathode of the diode D5.

[0052] For example, the switch tube Q5 adopts constant current control.

[0053] For example, the switch tube Q5 may be an N-channel MOSFET.

[0054] For example, a single lithium battery, namely a battery BT, can be connected through the first DC-DC conversion module 23 to form a battery pack as a whole, and the value presented to the outside is the bus voltage V bus The voltage is equivalent to connecting multiple batteries in series. Under the same power condition, the external current is reduced, which alleviates the high current and low voltage problem when a single battery is used in street light LEDs.

[0055] For example, the bus voltage V bus It can be 12V.

[0056] Please refer to FIG3 to understand that in some embodiments, the circuit applied to the street lamp further includes: a digital controller 36, the digital controller 36 outputs a switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 , switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 Control the switch tubes Q1 / Q2 / Q3 / Q4 / Q5 respectively.

[0057] Continuing with FIG4 , in some embodiments, the circuit for the street lamp further includes a solar panel PV and a control switch 45 . The control switch 45 controls the connection between the first DC-DC converter module 43 and the solar panel PV or the power factor correction module 42 , and the second terminal of the solar panel PV is connected to the ground terminal SGND.

[0058] For example, when there is sufficient sunlight, the control switch 45 controls the first DC-DC conversion module 43 to connect to the solar panel PV, the switches in the power factor correction module 42 and the second DC-DC conversion module 44 stop working, the street light LED does not emit light, and the switch in the first DC-DC conversion module 43 works. In this embodiment, the first DC-DC conversion module 43 is a bidirectional BUCK-BOOST topology structure, and the switch tube Q3 and the switch tube Q4 are complementary. By adjusting the duty cycle of the switch tube Q3 and the switch tube Q4, the voltage or current can be regulated; the solar panel PV supplies power to the battery BT through the first DC-DC conversion module 43. The battery BT stores the electrical energy generated by the solar panel PV and uses it to drive the street light LED at night to further save energy. When the light is insufficient, the control switch 45 controls the connection between the first DC-DC conversion module 43 and the power factor correction module 42. The battery BT supplies power to the street light LED through the first DC-DC conversion module 43 and the second DC-DC conversion module 44. The switch in the first DC-DC conversion module 43 keeps the voltage across the capacitor C3 stable. The switch tube Q5 in the second DC-DC conversion module 44 is turned on or off at a high frequency to adjust the current in the street light LED. When the power in the battery BT is insufficient, the alternating current AC first passes through the rectifier module 41 to obtain a DC voltage, and then passes through the power factor correction module 42 to obtain a bus voltage V bus , the bus voltage V bus The second DC-DC conversion module 44 is used to supplement the power supply for the street light LED. During off-peak hours, the AC power first passes through the rectifier module 41 to obtain a DC voltage, and then passes through the power factor correction module 42 to obtain a bus voltage V bus , the bus voltage V bus The battery BT is charged through the second DC-DC conversion module 44 .

[0059] Please refer to FIG5 to understand that in some embodiments, different from the embodiment shown in FIG4, the circuit applied to the street lamp more specifically includes: a digital controller 56, the digital controller 56 outputs a switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 , P 55 The switch control signal P Q1 , P Q2 , P Q3, P Q4 , P Q5 , P 55 Control switches Q1 / Q2 / Q3 / Q4 / Q5 / 55 respectively.

[0060] For example, digital controller 56 monitors the voltage across the LEDs in streetlights. When the voltage becomes unstable, switch 55 switches to battery BT power, minimizing the lifespan of the LEDs. Digital controller 56 can automatically charge and discharge the LEDs based on local peak and off-peak times or as needed. During charging and discharging, the LEDs can also be switched on and off as needed, extending their overall lifespan while also saving energy.

[0061] Continuing with FIG6 , in some embodiments, the circuit for the street lamp further includes a relay control module 68 and a relay module 67. The relay module 67 is connected to the relay control module 68, the power factor correction module 62, the solar panel PV, and the first DC-DC converter module 63. Under the control of the relay control module 68, the relay module 67 controls the input of the first DC-DC converter module 63 to connect to the output of the solar panel PV or the power factor correction module 62.

[0062] Please refer to FIG. 7 for understanding. In some embodiments, the relay control module 78 includes: a switch tube Q6, a switch tube Q7, a resistor R5, a voltage-stabilizing diode ZD1, a capacitor C7, a diode D6, a resistor R3, a capacitor C8, and a resistor R4. Among them, the source of the switch tube Q6 is connected to the ground SGND, the drain of the switch tube Q6 is connected to the first switch terminal of the relay module 77, and the gate of the switch tube Q6 is connected to the first end of the resistor R3; the emitter of the switch tube Q7 is connected to the second end of the coil of the relay module 77, the collector of the switch tube Q7 is connected to the output positive terminal of the power factor correction module 72, and the collector of the switch tube Q7 is connected to the first switch terminal of the relay module 77; the first end of the resistor R5 is connected to the collector of the switch tube Q7, and the second end of the resistor R5 is connected to the base of the switch tube Q7; the anode of the voltage-stabilizing diode ZD1 is connected to the The base of the switch tube Q7 is connected to the cathode of the voltage-stabilizing diode ZD1; the first end of the capacitor C7 is connected to the emitter of the switch tube Q7, and the second end of the capacitor C7 is connected to the ground SGND; the anode of the diode D6 is connected to the first end of the switch of the relay module 77, and the cathode of the diode D6 is connected to the second end of the coil of the relay module 77; the first end of the resistor R3 is connected to the gate of the switch tube Q6, and the second end of the resistor R3 is connected to the control signal G1; the gate of the switch tube Q6 is connected to the ground SGND through the capacitor C8, and the gate of the switch tube Q6 is connected to the ground SGND through the resistor R4.

[0063] For example, the switch tube Q6 may be an N-channel MOSFET.

[0064] For example, control signal G1, after being filtered by capacitor C8 and resistor R3, controls the on and off switching of switch Q6. When switch Q6 is on, the first terminal of relay module 77 is grounded, the coil of relay module 77 is energized, and the switch of relay module 77 switches, connecting the power factor correction module 72 to the first DC-DC converter module 73. When switch Q6 is off, the switch of relay module 77 does not switch, and the first DC-DC converter module 73 is connected to the solar panel PV.

[0065] For example, the control signal G1 may be generated by a single chip microcomputer or other control modules.

[0066] For example, the resistor R4 is used to prevent the gate from floating and to provide a discharge path for the parasitic capacitance of the switch tube Q6.

[0067] For example, the switch tube Q7, the voltage stabilizing diode ZD1, the capacitor C7, and the resistor R5 form a linear voltage stabilizing circuit, the purpose of which is to provide a stable voltage for the second end of the coil of the relay module 77. The breakdown voltage V Z1 Determines the voltage bias of relay module 77, which is approximately V Z1 -0.7V. Resistor R5 is used to limit the current flowing through the voltage stabilizing diode ZD1. Switching tube Q7 is a triode, which works in the variable resistance area and bears the bus voltage V bus The voltage drop across the second end of the coil of the relay module 77 keeps the voltage across the coil of the relay module 77 stable. The function of capacitor C7 is to help maintain the voltage.

[0068] For example, the function of the diode D6 is to provide a freewheeling loop when the coil inductance of the relay module 77 is reset.

[0069] In some embodiments, the circuit used in the street lamp further includes a diode D7 , wherein the anode of the diode D7 is connected to the first terminal of the solar panel PV, and the cathode of the diode D7 is connected to the positive output terminal of the power factor correction module 72 and the first terminal of the switch of the relay module 77 .

[0070] For example, when the AC power is cut off and the second DC-DC conversion module 74 is powered, the relay module 77 may be in a default state (i.e., connected to the solar panel PV) due to the busbar being out of power. The presence of the diode D7 allows the second DC-DC conversion module 74 to still raise the busbar voltage V bus , so that the busbar is restored, and the relay module 77 can normally switch to the state of connecting the busbar and the second DC-DC conversion module 74.

[0071] For example, the brightness of the street lamp LED can be adjusted by adjusting the driving signal of the switch in the second DC-DC conversion module 74 .

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments merely represent several implementation methods of the embodiments of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the concept of the embodiments of the present disclosure, all of which fall within the scope of protection of the embodiments of the present disclosure. Therefore, the scope of protection of the patent for the embodiments of the present disclosure shall be based on the appended claims.

Claims

1. A circuit applied to street lamps, comprising: A power factor correction module that outputs a bus voltage; A first DC-DC conversion module, whose input terminal is connected in parallel with the output terminal of the power factor correction module, and whose output terminal is connected in parallel with a battery; A second DC-DC conversion module, whose input terminal is connected in parallel with the output terminal of the power factor correction module, and whose output terminal is connected in parallel with street lamps.

2. The circuit applied to street lamps according to claim 1, wherein, During valley electricity, the bus voltage is generated by the power factor correction module. The bus voltage charges the battery via the first DC-DC conversion module, or the bus voltage charges the battery via the first DC-DC conversion module and supplies power to the street lamps via the second DC-DC conversion module at the same time, or the bus voltage supplies power to the street lamps via the second DC-DC conversion module; during peak electricity, the battery discharges via the first DC-DC conversion module to maintain the bus voltage, and the bus voltage supplies power to the street lamps via the second DC-DC conversion module.

3. The circuit applied to street lamps according to claim 2, wherein The circuit applied to street lamps further comprises: a rectification module, whose input terminal is connected to alternating current, and whose output terminal is connected in parallel with the input terminal of the power factor correction module.

4. The circuit applied to street lamps according to claim 3, wherein, The rectification module comprises: a first diode, a second diode, a third diode and a fourth diode. The cathode of the first diode is connected to the cathode of the second diode. The anode of the second diode is connected to the cathode of the fourth diode. The anode of the fourth diode is connected to the anode of the third diode. The cathode of the third diode is connected to the anode of the first diode. The first end of the alternating current is connected to the anode of the first diode. The second end of the alternating current is connected to the anode of the second diode. The input terminal of the power factor correction module is connected in parallel with the cathode of the second diode and the anode of the third diode.

5. The circuit applied to street lamps according to claim 4, wherein, The power factor correction module comprises: A first capacitor, one end of which is connected to the cathode of the second diode and the other end of which is connected to the anode of the third diode, A first transformer, the first end of the primary winding of which is connected to the cathode of the second diode, and the second end of the secondary winding of which is connected to the secondary ground terminal; A first switching tube, the first end of which is connected to the second end of the primary winding of the first transformer; A first resistor, one end of which is connected to the second end of the first switching tube and the other end of which is connected to the primary ground terminal; A second switching tube, the second end of which is connected to the first end of the secondary winding of the first transformer; A second capacitor, the first end of which is connected to the first end of the second switching tube, and the second end of which is connected to the second end of the secondary winding of the first transformer. Both ends of the second capacitor are connected to the input terminal of the first DC-DC conversion module.

6. The circuit applied to street lamps according to claim 5, wherein, The first DC-DC conversion module comprises: A third capacitor, which is connected in parallel with the second capacitor; A third switching tube, the first end of which is connected to the first end of the third capacitor; A fourth switching tube, the first end of which is connected to the second end of the third switching tube, and the second end of which is connected to the second end of the third capacitor and the negative electrode of the battery; A first inductor, the first end of which is connected to the first end of the fourth switching tube, and the second end of which is connected to the positive electrode of the battery; A fourth capacitor, with its first terminal connected to the second terminal of the first inductor and its second terminal connected to the second terminal of the fourth switching transistor.

7. The circuit applied to street lamps according to claim 6, wherein, The second DC-DC conversion module includes: A fifth capacitor, with its first terminal connected to the first terminal of the second switching transistor and its second terminal connected to the secondary ground terminal; A second inductor, with its first terminal connected to the first terminal of the fifth capacitor; A fifth switching transistor, with its first terminal connected to the second terminal of the second inductor and its second terminal connected to the second terminal of the fifth capacitor; A fifth diode, with its anode connected to the first terminal of the fifth switching transistor and its cathode connected to the first terminal of the street lamp; A sixth capacitor, with its first terminal connected to the cathode of the fifth diode and its second terminal connected to the second terminal of the fifth switching transistor; A second resistor, with one end connected to the second terminal of the sixth capacitor and the other end connected to the second terminal of the street lamp.

8. The circuit applied to street lamps according to claim 7, wherein, The circuit applied to the street lamp further includes: a digital controller, and the digital controller outputs a control signal for controlling the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor and the fifth switching transistor.

9. The circuit applied to street lamps according to claim 8, wherein, The digital controller monitors the voltage across the street lamp.

10. The circuit applied to a street lamp according to any one of claims 1-7, wherein, The circuit applied to the street lamp further includes: a solar panel, and the solar panel is connected to the input end of the first DC-DC conversion module to charge the battery or supply power to the street lamp.

11. The circuit applied to street lamps according to claim 10, wherein, The circuit applied to the street lamp further includes: a control switch for controlling the input end of the first DC-DC conversion module to be connected to the solar panel or the output end of the power factor correction module.

12. The circuit applied to a street lamp according to claim 11, wherein, When the input end of the first DC-DC conversion module is connected to the solar panel, the solar panel charges the battery through the first DC-DC conversion module.

13. The circuit applied to street lamps according to claim 12, wherein, The circuit applied to the street lamp further includes: a digital controller, and the digital controller outputs a control signal for controlling the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, the fifth switching transistor and the control switch.

14. The circuit applied to a street lamp according to claim 13, wherein, The digital controller monitors the voltage across the street lamp.

15. The circuit applied to a street lamp according to claim 10, wherein, The circuit applied to the street lamp further includes: A relay control module; A relay module, which is connected to the relay control module, the power factor correction module, the solar panel and the first DC-DC conversion module; under the control of the relay control module, the relay module controls the input end of the first DC-DC conversion module to be connected to the solar panel or the output end of the power factor correction module.

16. The circuit applied to a street lamp according to claim 15, wherein, The relay control module includes: A sixth switching transistor, with the source of the sixth switching transistor grounded, the gate of the sixth switching transistor connected to a control signal, and the drain of the sixth switching transistor connected to the first terminal of the switch of the relay module; A seventh switching transistor, with the collector of the seventh switching transistor connected to the first terminal of the switch of the relay module and the emitter of the seventh switching transistor connected to the second terminal of the coil of the relay module; A third resistor, with the first terminal of the third resistor connected to the collector of the seventh switching transistor and the second terminal connected to the base of the seventh switching transistor; A first zener diode, with the anode of the first zener diode grounded and the base of the seventh switching transistor connected to the cathode of the first zener diode; The seventh capacitor, the first end of the seventh capacitor is connected to the emitter of the seventh switching transistor, and the second end is connected to the anode of the first zener diode; The sixth diode, the anode of the sixth diode is connected to the first end of the switch of the relay module, and the cathode is connected to the second end of the coil of the relay module; The fourth resistor and the eighth capacitor, the gate of the sixth switching transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the control signal, and the gate of the sixth switching transistor is grounded through the eighth capacitor; The fifth resistor, the gate of the sixth switching transistor is grounded through the fifth resistor.

17. The circuit applied to street lamps according to claim 16, wherein, The circuit applied to the street lamp further includes: a seventh diode, the anode of the seventh diode is connected to the solar panel, and the cathode of the seventh diode is connected to the first end of the switch of the relay module.

18. The circuit applied to street lamps according to claim 16, wherein, The control signal is generated by a single-chip microcomputer.

19. The circuit applied to street lamps according to claim 1, wherein, The first DC-DC conversion module is a bidirectional BUCK-BOOST topology.

20. The circuit applied to street lamps according to claim 1, wherein, The second DC-DC conversion module is a BOOST topology.

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